Hinge last



Dec- 2, 1930 G. c. THOMAS' 3, 8

HINGE LAST Filed Nov. 18, 1921 Patented Dec. 2,. 1930' 7 IGEORGEHC. THOMAS, on Swam -scorn; m'smnusms;rssmms drnzmm I DOUBLE rrvo'r nAsnco rh-Nmor annuals, MAIIYE; A,coBroRArroNfon-mrnn wThis invention relates to collapsible'l'asts,

itive lock last, that "is, a *last which can be collapsed by 5 pressure alone butwhich offers lito collapse a definite and increasing resist- -i tion at 25'betwee'n its ends which themselves ance" over a short distance from the ex tended position, Lasts of this type require i i Figs.- 3, 4and5 are some sort of resilient structure to furnishthe yielding resistance. The invention of Lucas described and claimed in his application Sen-N0. 514,722, filed Nov. 12,;1921,

greatly simplifies previously known constructions by providing for this purpose a -resil; ient bar or pin which is slightly bent'hy the is a principal'object 0f the present invention still further to improve this type of last" without sacrificing any of the advantages gained by the invention mentioned "To this end, a feature of the invention consists in a resilient hinge or'anchor pin, arrangedtob'e deformed-preferably by a bonding member as the last collapses or extends, A very" simple, cheap constructionis thus provided,

Iwhich necessitates the'removalof littleweod and 1 is therefore of super or from the last strength.

including certain details of construction and combinations of parts willbe best under-- stood from the following description of a preferred embodiment selected' for purposes away, of the last in operative position?- 5 f Fig. 2 isa similar view of the last 'in 5001-;

lapsed position; 3

three diflerent forms of pins; g The forepartlO andheel part 1-2 are severed by a line of cut having a convenient shape] permitting relative movementof the parts for" I collapsing purposes; 'Itis preferably shaped V a to comprise an approximately arcuate portion-'5 14, abutting shoulders 16 at the bottom ffthe' 1 last and an open portion 18 at the top,"as willl be well understood by those skilled'inthe'art Thefparts are joine and'is disclosed in connection withanimpos- 1 respectively. iboth, if desired) has a notch,

"stresses incident to collapse and extension. It 1 to be on the side of the perspective v iewsg'or l poi'ntj32 half way between the center oftthef pin 24,- as shown inFig; land the point 34:

pins 22-jf a nd 24c inthe: heelpart and forepart,

One. of these or reduced porpreferably pins as'24, (or

retain their ordinary cylindrical form and fit closely in a holeflinthe last, as

seen. The pin must be" /4'or inch in diamfacein the Wood, and such a pin in its ordinary form would be very stiff. The pin awhich is located inthe' last part containing the arcuate portion 14: is located 0E from the -eter in order to provide suflicient bearing sur cei1ter'2 6 of that portion asshown in Fi .1.

The arcuate'porti'on thus, i nf-effect, constitutes a cam around thepin as center. As ftheyfo'repart is swungup aboutthefheel part "to 'theiposition shown in Fig. 2, the center of the pine emves in the @028 about the cen-{I f ter 26, whereas the center'of the hole in the link 20 in which the pin 24 is mounted moves inthe arc30 'about the center of the pin 22. This causes a compressive stress to be exerted H a -0n the pins 22 and 24 by tension in the link20. This and other features ofthe 1nvent1on,-

The reducedportionin-the'pin-2t is arranged V pintoward which'the pull of the linkis directed so that when this stress comesbn the, pin it will'b'end into/the vacant spacefformedby the'cutaway portion I i and furnish, therefore," a resilient resistance to" the collapsingjmovementwhich furtheraf f more continually increases during a small" movement of the forepart from eXtended po-f 'sition; tendingtherefore to throw the forepartf back intoextended position when slightly'displaced therefrom; j This resist 190 ance, in the construction shown, will "increase until the center of the pin 24; has reached the."

tendency of the pinlis to throw the last into collapsedpositiong. v i

The bent condition is shown in dottedlines a "inFig. 5Q Thepinmay be initiallybent in the reversedirection to'make it bind firmly in at 36 and 38 and the slot 40 milled out between them. Fig. 4 showsa pin 24 which consists of two semi-cylindrical members 42 and 44 cut away on their flat sides as at 46 and also shown as having their longitudinal ares bent about a transverse axis lying mthe plane of:

the slot 46 as shown in Fig. 4. The pin thus cylindrical hole in a last member will holdit; self strongly in positiondue' to the bindingac tion brought about by the curvature of the two halves. Since the hole in the last is of the same size as the ends of the pin and theslot 46 is actually milled out of the halves, the pin when reduced to a cylinder by being driven into the hole will still be slotted at its central.

portion and therefore resilient. e

The simplicity and strength of the illustrated construction is manifest. The entire bonding and impositive blocking mechanism consists of only three parts, the two pins and the link. It is cheap to manufacture and simple in. operation, as no parts can get out of order with the possible exception of the resilient pin which can easily be replaced if broken.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United Statesis:' I V 1. In a collapsible last, a hinge pin, means for exerting a lateralstress'on the pin in collapse, the pin having a notch cut inthat side toward which the stress of collapse tends to bend the pin. 2. In a collapsible last having two relatively'movable parts, a hinge pin connecting the last parts and having a substantially discontinuously noiruniform cross-section and bein arran ed to bend. underressure dur- ZD b ing movement of the last parts.

3. In acollapsiblelast having two relatively V movable parts, a hinge pin connecting the last parts and having a longitudinal flat cut in its side arranged to facilitate a resilient deformation of the pin under the stressof collapse. i

4. In acollapsible last having'two relatively movable parts, a cylindrical hinge pin connecting the last parts and cut awayata point between its ends arranged to facilltate bending underthe stress of collapse. I 5. A hinged last having two relatively movable parts one of which parts has a straight hole therein, and a resilient hinge pin in said hole-arranged to connect the last parts and to. receive a-bending stress from the last parts as they move from extended posi-.

tion, 'said' pin having a normally bent portion shorter than said straight hole whereby when saidpi-nis driven into the hole its inherent whereby the collapsing movement is resiliently opposed. 7-.= In-"a collapsible-last,- a-resilient hinge pin having a notch, and 'a-bonding member co-op erat1ng with the p1n constructed and arformed when driven into a closely fittmgrangedto press transversely thereon as the last moves from extreme position, the plane o'fthebot'tom of the notch being arranged to be substantially perpendicular to the line.

hinge pin arranged to receive a bending stress transmitted from the last parts as they move relatively, and to bend substantially under the stress. i

9,. In a last, a forepart and a heel part constructed'and arranged to move relatively to collapse the last, a bonding member uniting the parts, and a resilient pin anchoring said-member in a last part,,there being space providedin' the last to permit substantial distortion of the pin, the last parts and'member being constructed to exert a bending stress on the pin. as the last starts to collapse, and the pin being arranged to bend substantially under thestress whereby a non-positive lock is produced.

lOLA. lasthaving a resilient hinge pin,

and a forepart and a heel part connected thereby and constructed and arranged to move relatively to collapse or extend the last,

and toexert a bending stress on the hinge pin as the last parts move relatively, the last being provided with aspace adjacent to the pin to permit bend ng of the pm under the stress.

11. In a last, a bonding member, a forepart and. a heel part connected thereby and arranged to move relatively to collapse or'e2;-

tendtlie; last andtoexert stress on the bonding member during such movement, and a resilient hinge pin engaged by the bonding member and arranged to bend under pressure exertedbythe bonding-member as the last collapses. i

12. In a last, a bonding member, aiforepart and a heelpart connectedthereby and arranged to move relatively to collapse. or extend the last and to exert stress on the bondinggme'mber during such movement, and a resilient hinge pin anchoring the'bonding .member in a last part and arranged to bend under pressure exerted by. the bonding member} as-cthe last collapses, there-being a space provided in the last in connection with the pingto permi't the bending.

. curve, and and a pinanchoring the bonding member in the other last part, wherebythe- 21.. A last comprising a toe part and a heel part, a link,a11d resilient pins for attaching the link'to said last parts whereby the two last parts are held against separation.

In testimony whereof I have signed my name to this specification.

. GEORGE C. THOMAS.

collapse of the last exerts a bending stress on the pins, the lasthaving a space to permit I substantial bending of one of the pins, said last-named pin being arranged to bend sub-' v stantiall'y under said stress.

14,: In a collapsible last, a forepart anda heelpartseparated by a cut comprising. a cam portion,abondingmember uniting the parts,

and a resilient pin anchoring the bonding member in that last part which contains the cam portion, said pin being substantially off the center of said cam portion, whereby the collapse'of the last exerts a bending stress in the last adjacent to the pin to permit the "bending of thetpin under the said'stress.

' 15. In a collapsible last havingtwo relatively movable parts a resilient hinge pin the last parts. Y Y 16. In a last, ahinge pin having its fiexibility variable along its length, there being a space provided inth'e last adjacent to 'a por V tion of greater flexibility to permit bending.

connecting the last partsand having its flexi- 'onthe pin, there being also aspace provided bility substantially irregularly variable along I 7 its length to facilitate bending under stress exerted on the 17. In acollapsible last, a forepart" and a heel part arranged for relative movement to collapse and extend the last, and a bonding mechanism connecting said parts constructed and arranged to hold them yieldingly in either their extended or collapsed position,

' said mechanism comprising aresilient hinge pin, the last belng provided with space into which the hinge pin may bend to effect the pin by relative movement of said yielding. operation of the bonding mechanism.

18. Ina collapsible last a hinge pin ofnon- V unifOrmcrOSs-section mounted in a hole providing a substantial clearance onone side, and means for stressing the pin toward that s de in the operation of collapse;

19. In a collapsible last, a heel part, afore part, a bonding member and a distortable hinge pin arranged for relative movement of the last parts in collapse, the last parts and bonding member being arranged ,toexertstresses substantiallyf opposite in direction upon the hinge pin atsubstantially separated points, and the last having a space'for consequent deformation of the pin.

. 20. A last comprising a toe' part and wheel part, a link, and means one of which is re- I i silient for attaching the link to the toe part and the heel part of the last, to hold the last parts against separation. 7 I 

